Question

What is the total surface area of a cone having radius 7cm and height 21cm?




Pls ans fast.......

Answer 1

Answer:

640.73 cm square

Step-by-step explanation:

• the total surface area of cone

Answer 2

Step-by-step explanation:

We know that total surface area of cone if base radius r and slant height l = πr(l+r)

Here r=7 cm

height=h=21 cm

so l=√7²+21²

=√49+441

=√490=7√10cm

so total surface area=πr(l+r)

=(22/7)×7×(7√10+7)

=22×(7√10+7)

=22×7×(√10+1)

=154(3.16+1)

=154×4.16

=640.64sq.cm (answer)

hope you got it.